R1EV24004ASAS0I

Write Operations (WP=High)

Byte Write: (Write operation during WP=High status)

A write operation requires an 8-bit device address word with R/W = “0”. Then the EEPROM sends acknowledgment

"0" at the ninth clock cycle. After these, the 4k bit EEPROM receives 8-bit memory address. Upon receipt of this

memory address, the EEPROM outputs acknowledgment "0". After receipt of 8-bit write data, the EEPROM outputs

acknowledgment "1"(NO ACK). Then the EEPROM write operations are not allowed.

Byte Write Operation

Device

address

Memory

address (n)

Write data (n)

4k

10 10

W

Stop

Start

ACK

ACK

R/W

No ACK

WP

Page Write: (Write operation during WP=High status)

The page write is the same sequence as the byte write. The page write is initiated by a start condition, device address

word and memory address(n) with every ninth bit acknowledgment"0". But after inputting write data(Dn) , the

EEPROM outputs acknowledgment "1"(NO ACK). Then the EEPROM write operations are not allowed.

Page Write Operation

Device

address

Memory

address (n)

Write data (n+m)

Write data (n)

4k

10 10

W

Stop

Start

ACK

No ACK

ACK

R/W

WP

No ACK

R10DS0123EJ0100 Rev.1.00

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Apr. 08, 2013